Super twist nematic liquid crystal display driver for reducing power consumption
First Claim
1. A super twist nematic (STN) liquid crystal display (LCD) driver which drives a STN LCD panel, the STN LCD driver comprising:
- a reference voltage generating unit which generates a reference voltage in response to an external voltage;
a voltage boosting unit which generates a boosting voltage by boosting the external voltage;
a voltage control unit which generates a first segment voltage and a second segment voltage which drive a segment electrode of the STN LCD panel in response to the reference voltage and the boosting voltage;
a first common voltage generating unit which drives a common voltage of the STN LCD panel in response to the external voltage, a ground voltage, and the first segment voltage and generates a first common voltage, the voltage level of which is higher than the voltage level of the first segment voltage, using a predetermined resistance ratio; and
a second common voltage generating unit which drives a common voltage of the STN LCD panel in response to the external voltage, the ground voltage, and the first segment voltage and generates a second common voltage, the voltage level of which is lower than the voltage level of the first segment voltage, using a predetermined resistance ratio.
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Accused Products
Abstract
Provided is a super twist nematic (STN) liquid crystal display (LCD) driver which reduces power consumption. The STN LCD driver includes a reference voltage generating unit, a voltage boosting unit, a voltage control unit, a first common voltage generating unit, and a second common voltage generating unit. The reference voltage generating unit generates a reference voltage in response to an external voltage. The voltage boosting unit generates a boosting voltage by boosting the external voltage. The voltage control unit generates a first segment voltage and a second segment voltage which drive a segment electrode of the STN LCD panel in response to the reference voltage and the boosting voltage. The first common voltage generating unit drives a common voltage of the STN LCD panel in response to the external voltage, a ground voltage, and the first segment voltage and generates a first common voltage, the voltage level of which is higher than the voltage level of the first segment voltage, using a predetermined resistance ratio. The second common voltage generating unit drives a common voltage STN LCD panel in response to the external voltage, the ground voltage, and the first segment voltage and generates a second common voltage, the voltage level of which is lower than the voltage level of the first segment voltage, using a predetermined resistance ratio.
14 Citations
29 Claims
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1. A super twist nematic (STN) liquid crystal display (LCD) driver which drives a STN LCD panel, the STN LCD driver comprising:
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a reference voltage generating unit which generates a reference voltage in response to an external voltage;
a voltage boosting unit which generates a boosting voltage by boosting the external voltage;
a voltage control unit which generates a first segment voltage and a second segment voltage which drive a segment electrode of the STN LCD panel in response to the reference voltage and the boosting voltage;
a first common voltage generating unit which drives a common voltage of the STN LCD panel in response to the external voltage, a ground voltage, and the first segment voltage and generates a first common voltage, the voltage level of which is higher than the voltage level of the first segment voltage, using a predetermined resistance ratio; and
a second common voltage generating unit which drives a common voltage of the STN LCD panel in response to the external voltage, the ground voltage, and the first segment voltage and generates a second common voltage, the voltage level of which is lower than the voltage level of the first segment voltage, using a predetermined resistance ratio. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A super twist nematic (STN) liquid crystal display (LCD) driver which drives an STN LCD panel, the STN LCD driver comprising:
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a reference voltage generating unit which generates a reference voltage in response to an external voltage;
a first segment voltage generating unit which receives the reference voltage in response to the external voltage and generates a first segment voltage which drives a segment electrode of the STN LCD panel;
a second segment voltage generating unit which generates a second segment voltage by boosting the first segment voltage;
a first common voltage generating unit which drives a common electrode of the STN LCD panel in response to the external voltage, the ground voltage, and the first segment voltage and generates a first common voltage, the voltage level of which is higher than the voltage level of the first segment voltage, using a predetermined resistance ratio; and
a second common voltage generating unit which drives a common electrode of the STN LCD panel in response to the external voltage, the ground voltage, and the first segment voltage and generates a second common voltage, the voltage level of which is higher than the voltage level of the first segment voltage, using a predetermined resistance ratio. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A super twist nematic (STN) liquid crystal display (LCD) driver which drives an STN LCD panel, the STN LCD driver comprising:
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a reference voltage generating unit which generates a reference voltage in response to an external voltage;
a first segment voltage generating unit which receives the reference voltage in response to the external voltage and generates a first segment voltage driving a segment electrode of the STN LCD panel;
a second segment voltage generating unit which generates a second segment voltage by boosting the first segment voltage;
a first common voltage generating unit which drives a common electrode of the STN LCD panel in response to a second common voltage and the first segment voltage and generates a first common voltage having a voltage level that is N (where N is an integer) times the difference of the voltage level of the second common voltage from the voltage level of the first segment voltage; and
a second common voltage generating unit which drives a common electrode of the STN LCD panel in response to the external voltage, the ground voltage, and the first segment voltage and generates the second common voltage having a voltage level that is lower than the voltage level of the first segment voltage using a predetermined resistance ratio. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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27. A super twist nematic (STN) liquid crystal display (LCD) driver which drives an STN LCD panel, the STN LCD driver comprising:
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a reference voltage generating unit which generates a reference voltage in response to an external voltage;
a voltage boosting unit which generates a boosting voltage by boosting the external voltage;
a voltage control unit which generates a first segment voltage and a second segment voltage which drive a segment electrode of the STN LCD panel in response to the reference voltage and the boosting voltage;
a first common voltage generating unit which drives a common electrode of the STN LCD panel in response to a ground voltage and the second segment voltage and generates a first common voltage having a voltage level that is M (where M is an integer) times the difference of the voltage level of the ground voltage from the voltage level of the second segment voltage; and
a second common voltage generating unit which drives a common electrode of the STN panel in response to the ground voltage and the second segment voltage and generates a second common voltage having a voltage level that is 1/M ( where M is an integer) times the difference of the voltage level of the ground voltage from the voltage level of the second segment voltage. - View Dependent Claims (28, 29)
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Specification